- ADA-ES, Inc.
- Alberta Environment
- ALSTOM Power Inc.
- Ameren Energy Fuels and Services
- American Coal Ash Association
- American Electric Power
- Apogee Scientific, Inc.
- Argillon
- Arizona Department of Environmental Quality
- Arizona Public Service
- Basin Electric Power Cooperative
- Big Sky Carbon Sequestration Partnership
- Boral Material Technologies
- Cansolv Technologies Inc.
- Champagne Coal Consulting Inc.
- Chemical Lime Company
- Cleco Power LLC
- Colorado Department of Public Health and Environment
- Custom Instrumentation Services Corporation (CiSCO)
- Diversified Energy
- Doosan Heavy Industries & Construction
- Douglas Scientific, Inc.
- DTE Energy
- Electricity Supply Board
- Energy & Environmental Research Center
- Energy Technologies Inc.
- EPCOR
- EPRI
- Evergreen Energy Inc.
- Exergetic Systems
- FMI - Cowboy Coal
- Frontier Geosciences Inc.
- Fuel Tech, Inc.
- Great River Energy
- Headwaters Resources
- Headwaters, Inc.
- Hetagon Energy Services, Inc.
- JFS Management
- Kansas City Power & Light
- Korea Western Power Co., Ltd.
- Lehigh University
- Limno-Tech, Inc.
- Melzer Consulting
- MIC-USA, LLC
- Mineral Resource Technologies, Inc., A CEMEX Company
- Ministry of Environment of Haïti
- Minnesota Valley Testing Laboratories
- Minnkota Power Cooperative, Inc.
- MinPlus
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- Monash University
- Montana Tech of the University of Montana
- MSE-Technology Applications
- Nebraska Ash Company
- Nebraska Public Power District
- Nexant, Inc.
- NORIT Americas
- Omaha Public Power District
- Ontario Ministry of the Environment
- Ontario Power Generation/Atikokan GS
- Pacificorp Engineering - Jim Bridger Plant
- Platte River Power Authority
- Portland General Electric
- Power & Industrial Services
- Powerspan Corporation
- Princeton Energy Resources International, LLC
- Rentech Inc.
- Rio Tinto Energy America
- Salt River Materials Group
- Salt River Project
- Sargent & Lundy
- SaskPower
- Sasol Technology (PTY), Ltd
- Southern Company
- Southern Environmental, Inc.
- Spinheat Ltd.
- SPX Cooling Technologies
- Storm Technologies, Inc.
- Technical University of Denmark
- Teledyne Monitor Labs, Inc.
- Tetra Tech EM, Inc.
- The Babcock & Wilcox Company
- The Climate Trust
- TransAlta Utilities Corporation
- U.S. Department of Energy National Energy Technology Laboratory
- U.S. Environmental Protection Agency
- U.S. Geological Survey
- United States Gypsum Company
- University of Cincinnati
- University of New Mexico
- URS Corporation
- Washington Group International
- We Energies
- Wenck Associates
- West Virginia Water Research Institute
- Western Research Institute
- Wyoming Analytical Labs, Inc.
- Xcel Energy
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